Comparison of three ultrasound ratios in term low birth weight babies – is there a role for thigh circumference?

Hebbar, Shripad and Varalakshmi, N (2007) Comparison of three ultrasound ratios in term low birth weight babies – is there a role for thigh circumference? Calicut Medical Journal, 5 (3). pp. 1-14.

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Abstract

Objectives: To evaluate the validity of HC/AC (Head Circumference/Abdominal Circumference), FL/AC (Femur Length/Abdominal Circumference) and FL/TC (Femur Length/Thigh Circumference) ratios in term LBW (Low Birth Weight) babies. Materials And Methods: One hundred and two singleton pregnancies were evaluated antenatally at term gestation (38 to 42 weeks) by ultrasound. Thigh circumference (TC) was determined at the mid level of the thigh. Biparietal diameter (BPD), Head circumference (HC), Abdominal circumference (AC), and Femur length (FL) were measured using standard techniques. Ultrasound biometry was performed within a week prior to delivery. Of these 102 patients, 39 delivered babies weighing less than 2500 grams and they constituted study group. Birth weight was more than 2500 grams in 69 patients and this group was taken as control group. Three ratios mainly HC/AC, FL/AC and FL/TC were calculated in these groups and were analysed for their sensitivity, specificity, positive predictive value and negative predictive value to predict growth restriction at term. Results: The best cut off values were 1.02 for HC/AC, 0.24 for FL/AC, 0.52 for FL/AC. All the three ratios significantly predicted growth restriction. FL/TC had the highest ability in this aspect (Sensitivity 82%, Specificity 81%, Positive Predictive Value 73% and Negative Predictive Value 87%). Conclusion: Growth restricted fetuses have decreased thigh circumference and increased FL/TC ratio because of decreased thigh muscle mass and subcutaneous fat. Thigh circumference measurements are simple and appear to have a major role in detecting intrauterine growth restriction.

Item Type: Article
Uncontrolled Keywords: head circumference; abdominal circumference; thigh circumference; intrauterine growth restriction.
Subjects: Medicine > KMC Manipal > Obstetrics & Gynaecology
Depositing User: KMC Manipal
Date Deposited: 28 Aug 2013 11:49
Last Modified: 28 Aug 2013 11:49
URI: http://eprints.manipal.edu/id/eprint/136955

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